stat math
posted by helga on .
Stat hw question help me please?
In a high profile murder case a sample of the general public's opinions concerning the guilt or innocence of the defendant is taken. A sample of n=100 males results in 62% of the respondents beliving that the defendant is guilty, while a sample of 120 females results in 58% of the respondents beliving that the defendant is guilty.
A. calculate a 95% confidence interval for the percentage of males who believ that the defedant is guilty.
b. calculate a 95% confidence interval for the percentage of females who believe that the defendant is guilty.
c. based on a and b , does it appear that a majority of both males and females believed the defendant is guilty?

Calculate the standard deviation.
SD = sqrt(p*q/n) = sqrt(.62*.38/100) = .0485.
95% confidence interval (use alpha=1.96)  ranges between .62+.0485*1.96 and .62.0485*1.96
Repeat for females.